DSK10E Equivalent & Substitute Parts

Part Overview

The DSK10E is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, support legacy system repairs, and enable procurement from active inventory sources.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	10 µA @ 400 V
Mounting Type	Through Hole
Package / Case	R-1, Axial
Operating Temperature - Junction (Max)	150°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DSK10E is determined by strict equivalence of electrical and mechanical parameters. The following criteria establish functional interchangeability:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package compatibility: Axial or DO-41/DO-204AL configurations

Secondary Considerations:

Forward voltage (Vf) at rated current
Recovery speed classification (Standard or Fast Recovery)
Reverse leakage current characteristics
Operating temperature range
Product status (Active preferred over Last Time Buy or Obsolete)

Substitute parts are grouped into two categories: direct axial package equivalents and functionally equivalent DO-41/DO-204AL package alternatives. All listed substitutes meet or exceed the minimum electrical specifications of the DSK10E.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Speed	Ir @ Vr	Package	Temp Range	Status
DSK10E	onsemi	400 V	1 A	1.1 V @ 1 A	Standard >500ns	10 µA @ 400 V	R-1, Axial	-/150°C	Obsolete
1N4004G	Rectron USA	400 V	1 A	1 V @ 1 A	Standard >500ns	200 nA @ 400 V	DO-204AL, DO-41	-65/175°C	Active
EGP10G	Fairchild Semiconductor	400 V	1 A	1.25 V @ 1 A	Fast ≤500ns	5 µA @ 400 V	DO-204AL, DO-41	-65/150°C	Active
RGP10G	Fairchild Semiconductor	400 V	1 A	1.3 V @ 1 A	Fast ≤500ns	5 µA @ 400 V	DO-204AL, DO-41	-65/175°C	Active
UF4004	Diotec Semiconductor	400 V	1 A	1.25 V @ 1 A	Fast ≤500ns	5 µA @ 400 V	DO-204AC, DO-41	-50/175°C	Active
1N4004-AP	Micro Commercial Co	400 V	1 A	1 V @ 1 A	Standard >500ns	5 µA @ 400 V	DO-204AL, DO-41	-55/150°C	Active
1N4004-BP	Micro Commercial Co	400 V	1 A	1 V @ 1 A	Standard >500ns	5 µA @ 400 V	DO-204AL, DO-41	-55/150°C	Active
1N4004-T	Diodes Incorporated	400 V	1 A	1 V @ 1 A	Standard >500ns	5 µA @ 400 V	DO-204AL, DO-41	-65/150°C	Last Time Buy
1N4246	Microchip Technology	400 V	1 A	1.3 V @ 3 A	Standard >500ns	1 µA @ 400 V	A, Axial	-65/175°C	Active
1N4936-E3/54	Vishay General Semiconductor	400 V	1 A	1.2 V @ 1 A	Fast ≤500ns	5 µA @ 400 V	DO-204AL, DO-41	-50/150°C	Active
1N4936-T	Diodes Incorporated	400 V	1 A	1.2 V @ 1 A	Fast ≤500ns	5 µA @ 400 V	DO-204AL, DO-41	-65/150°C	Active

Engineering Selection Recommendations

For Direct Axial Package Replacement:

The 1N4246 manufactured by Microchip Technology is the primary equivalent for axial package applications. It maintains the R-1/Axial package configuration, meets all electrical specifications, and carries Active product status with extended operating temperature range (-65°C to 175°C). This part is suitable for direct substitution in legacy designs requiring axial lead geometry.

For DO-41/DO-204AL Package Alternatives:

When PCB layout or mechanical constraints permit package conversion to DO-41 or DO-204AL, the following parts are recommended in order of preference:

1N4004-AP or 1N4004-BP (Micro Commercial Co): Active status, standard recovery characteristics matching the DSK10E, forward voltage of 1 V @ 1 A, and operating temperature range of -55°C to 150°C. These parts provide closest electrical equivalence to the original specification.
1N4004-T (Diodes Incorporated): Active status with Last Time Buy designation, standard recovery characteristics, 1 V forward voltage, and extended lower temperature limit (-65°C). Suitable for applications requiring wider temperature range.
1N4004G (Rectron USA): Active status, standard recovery, 1 V forward voltage, and automotive-grade qualification (AEC-Q101). Recommended for applications requiring automotive-grade reliability.
1N4936-E3/54 or 1N4936-T (Vishay and Diodes Incorporated): Fast recovery alternatives with 1.2 V forward voltage and Active status. Suitable for applications where faster switching characteristics provide circuit benefits.
EGP10G or RGP10G (Fairchild Semiconductor): Fast recovery alternatives with Active status and extended temperature range to 175°C. Forward voltage specifications of 1.25 V and 1.3 V respectively.
UF4004 (Diotec Semiconductor): Fast recovery alternative with Active status and operating temperature range of -50°C to 175°C. Forward voltage of 1.25 V @ 1 A.

All recommended substitutes are currently in active production or available from inventory. Selection should prioritize Active status parts and consider specific application requirements for recovery speed, forward voltage characteristics, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the DSK10E be directly replaced with a DO-41 package diode?

A: Direct mechanical replacement requires package conversion. The DSK10E uses an R-1 axial package, while most active substitutes use DO-41 or DO-204AL packages. PCB layout modification is necessary. The 1N4246 in axial package provides direct mechanical compatibility without layout changes.

Q: What is the difference between Standard Recovery and Fast Recovery diodes in this application?

A: The DSK10E specifies Standard Recovery (>500ns). Substitute parts with Fast Recovery (≤500ns) characteristics, such as EGP10G, RGP10G, UF4004, 1N4936-E3/54, and 1N4936-T, switch faster but are electrically compatible. Fast recovery diodes reduce switching losses in high-frequency applications but are not required for standard rectification circuits.

Q: Are all listed substitutes electrically equivalent to the DSK10E?

A: All listed substitutes meet or exceed the minimum electrical specifications: 400 V reverse voltage, 1 A average rectified current, and through-hole mounting. Forward voltage varies between 1 V and 1.3 V depending on the part. Reverse leakage current is generally lower in substitutes. These differences are within acceptable tolerances for general-purpose rectification applications.

Q: Which substitute offers the best temperature range coverage?

A: The RGP10G and UF4004 offer the widest upper temperature limit at 175°C, compared to the DSK10E maximum of 150°C. The 1N4004-T and 1N4936-T extend the lower temperature limit to -65°C. Selection depends on specific application temperature requirements.

Q: Is the 1N4004 series suitable as a substitute?

A: Yes. The 1N4004-AP, 1N4004-BP, and 1N4004-T are all suitable substitutes. They provide standard recovery characteristics matching the DSK10E, forward voltage of 1 V @ 1 A, and Active product status. These parts are widely available and represent cost-effective alternatives.

Q: What compliance certifications should I verify for my application?

A: The 1N4004G carries AEC-Q101 automotive qualification. The 1N4004-T, 1N4936-E3/54, and 1N4936-T are ROHS3 compliant. Verify specific compliance requirements for your application before final part selection. All listed parts carry EAR99 export classification and HTSUS code 8541.10.0080.

Q: Can I use a substitute with higher reverse voltage rating?

A: Yes. All listed substitutes are rated for 400 V reverse voltage, matching the DSK10E specification. Higher voltage ratings are not provided in this substitute list. Using a part with equal or higher voltage rating maintains design safety margins.

Q: What is the significance of reverse leakage current differences?

A: The DSK10E specifies 10 µA @ 400 V reverse leakage. Most substitutes specify 5 µA or lower. Lower leakage current improves circuit performance in high-impedance applications. This difference is generally beneficial and does not restrict substitution.

Q: Are packaging options limited to DO-41 and axial?

A: The substitute list includes DO-41, DO-204AL, DO-204AC, and axial (R-1 and A) packages. DO-41 and DO-204AL are equivalent package designations. DO-204AC is a variant. Axial packages (1N4246) provide direct mechanical compatibility with the DSK10E without PCB modification.

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